Why does my Thunderbird take several seconds to move from one email to the next or is not responding
It takes several seconds for me to move from one email to another or to delete a message. If I try to move again it says that it is not responding and then I have to wait some more
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Are you another McAfee customer? If so read this.
https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues